This is almost always the result of a dirty or obstructed safety feature.
Garage door opener reopens after closing.
Most garage door openers have an open and close limit control.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs.
If it closes before that distance has been traveled it thinks something is wrong and it reopens to help prevent any damage or safety risk.
This is a built in safety feature that is there in the event that something or someone gets in the way of the closing door.
6 turn the up limit switch screw clockwise by one turn for every 3 inches that you need the garage door to raise up with a flat blade screwdriver.
Clean the button as well as the connections in the housing if this is the case.
If pushing the wall button and holding it does not make the door fully close then it is quite possible that your door is reversing itself because it is sensing undue resistance.
Your garage door is programmed to travel a certain distance before it closes.
It goes partway down reverses direction and goes back up again.
If not re engage it.
Replace broken chain belts sprockets or pulleys.
An exposed spot or a short circuit in the small gauge wire that leads from the garage door opener s motor unit to the control button on the wall may well cause your garage door to operate all on its own.
But changes in weather conditions can causes your garage door components to shift or contract.
This will cause the door to open and close until the button becomes unstuck.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
You push the button to close the garage door.
Opener runs but the garage door does not move screw drive models make sure the carriage is engaged.
To troubleshoot the garage door opener button make sure it s clean and free of debris.
Set the step ladder under the garage door opener in your garage and use it to access the up and down limit switch adjustment screws located on the side of the garage door opener motor housing.
Close the garage door with the opener and watch it closely as it closes.
Check to make sure the pulley is not boken.